The car idles fine. When driving at at a slow acceleration no problem. but at faster acceleration car will miss,hesitate. Driving steady speed no problem. If put in neutral and step on gas engine will miss or hesitate. I have tested Coils and ignition control module checks out ok. Was wondering if the catalytic converter might be the problem.
Without seeing the vehicle, it's hard to say. Here are a couple things you could check.
O2 sensors - if they are reading incorrectly they could be causing the vehicle's computer to supply less gas, which my cause a hesitation.
The fuel system - you could check the fuel pressure, fuel pump and the injectors.
The ignition system - since you've checked the coils and ICM, I would suggest you look at plugs and wires as well.
I'm surprised that you're not getting a check engine light on.
Here's a site to read about catalytic converters and how to tell if they are bad.
〉 Answered on Aug 12th, 2008 by Lori Johnson, Owner and Instructor at Ladies Start Your Engines